Rock-drilling engine.



J. G. LEYNER.

ROCK DRILLIN'G ENGINE? APPLIUA'rIon rILnD JULY 5,1910.

1,058,072. Patented Apr. 8, 1913.

2 BHEETHHEET 2.

ZZ/neJJeJ z UNITED STATES PATENT OFFICE.

JOHN -GEORGE LEYNER, OF DENVER, COLORADO, ASSIGNOR TO THE J. GEO. LEYNERENGINEERING WORKS COMPANY, 0F LITTLETON, COLORADO, A CORPORATION OFCOLORADO.

ROCKDRILLING ENGINE.

Application led July 5, 1910.

To all whom t may concernv Be it known that I, JOHN GEORGE LEYNER, acitizen of the United States of America, residing in the city and countyof Denver and State of Colorado, have invented a new and usefulRock-Drilling Engine, of which the following is a specification.

My invention relates to improvements in rock drilling engines, and theobject of my invention lis to provide a rock drilling engine in whichthe hammer piston cylinder and its cylinder heads are held in operativerelation to each other by resiliently yielding connections. I attainthis yobject by the mechanism illustrated in the accompanying drawings,in which:

Figure 1 is a plan view of my improved rock drilling engine. Fig. 2, isa longitudinal, central, sectional view of Fig. 1. Fig. 3 is a frontview of the cap for the front cylinder head. Fig. 4 is a rear viewthereof. Fig. 5 is a horizontal sectional view of the same on the line5-5 of Fig. 3. Fig. 6 is an elevation of the rear cylinder head, thewater inlet hub thereof being shown in section.

Similar letters of reference refer to similar parts throughout theseveral views.

Referring to the drawings, the numeral 1 designates the supporting baseof my improved rock drilling engine, which I term a guide shell, itbeing so called because it forms a support and also a guide for feedingthe drilling engine forward toward and backward from rock when inoperative drilling relation thereto.

The rock drilling portion of my rock drilling engine comprises thecylindrical casing 4, in which a cylindrical bore is formed, which isadapted to receive the hammer piston. At the opposite end portions ofthe cylinder counterbores 23 and 24 are formed, which are adapted toreceive front and rear cylinder heads 25 and 26. The hammer piston boreis preferably a straight bore of one diameter, and in it a hammer piston27 is reciprocally mounted. This hammer piston is reciprocally mountedin the cylindrical bore of the casing, and it is provided at its frontend with a hammer bar extension 28 of smaller diameter than its pistonhead portion, which extends reciprocally through a rirg 29, which I termithe front cylinder ring. The front cylinder ring is placed at thejunction of the cylin- Speciiication of Letters Patent.

Patented'A pr. 8,191 3.

Serial No. 570,339.

dcrs hammer piston bore and of the counter bore 24 of the cylindercasing.

The front cylinder head 26 comprises a tubular-shaped casing which isprovided with collar portions 30 adjacent to its oppo- 60 site ends. Therear end of this front cylinder head .extends into the counter bore 24of the hammer piston cylinder. This front cylinder' head is providedwith a straight cylindrical bore in which a sleeve 31 is 35 rotatablymounted. This sleeve 31 I term the chuck sleeve. This chuck sleeve 31 isprovided with an aXial bore of two different diameters, which arebotharranged in axial alinement with the bore of the hammer .7,0

piston cylinder; The larger axial bore 327i/ extends from the rear endof the chucl/ .sleeve to Within a short distance of its front end, whereitterminatsina smaller bore` 33,

and a shoulder 34 is forme'dat the junction ,g5

of these two bores. A bushing 35, which I term the chuck bushing, fitstightly in the bore 32 of the ychuck sleeve and is seated; against theshoulder 34. The entrance to the rear end of the chuck sleeve isthreaded, so

39, which I term the chuck ring, is placed in (i5 the bore 32, betweenthe chuck nut andth'e chuck bushmg 35. A cap 42 fits over th i frontterminal end portion of the 'fro'n' hcylinder head against the frontcollar 30 formed on the cylinder head. At the rear end of the cylindercasing a ring 43, which I term the rear cylinder ring, is placed in thecounter 'bore 23 of the casing of t e cylinder against the shoulderformed at the junction of the said counter bore and the hammer preventthe compressed air in the cylinder 10c from leaking past it and the hubof the rear cylinder head to the atmosphere. The rear cylinder head 25is provided with a hub poition 46 that extends a short distance into thecounter bore 23 of the'cylinder close/to the 1105r adjacent side of thering 43. Thesecylinder rings 29 and 43 act as buffers to such reciprocalstrokes of the hammer piston as anh not cushioned by the compressed aixlactu-.t-

ing fluid when the hammer piston is not 11C striking against a drill bitthat is not in operative position against a rock. The cyllnder and thecylinder heads and the front cap are arranged to be clamped togetherunder a resilient clamping pressure of sufiicient tension to hold themin operative alinement and position under such operative strains as thedrilling engine is subjected t0 while drilling rock.

My invention contemplates in this respect any means by which theseseveral parts can be resiliently clamped or secured together so thateach will have a slight yielding movement independent of the othersunder severe strains and which will enable an operator to take themachine apart and put it together again in a few moments When necessaryto repair or otherwise keep it in operative order; and, while a numberof different methods of connecting this result might be employed, Ipreferably,

sides of the opposite ends of the cylinder of the drilling engine andthe opposite sides of the front cap and of the rear cylinder head areprovided with laterally projecting lug portions 46A, in which apertures47 are formed, through which bolts 48 extend loosely. These bolt-rodsextend through the apertures of the lugs from of the bolt-rods extendthrough and far enough beyond the back head to each rcceive a nut 51A.The apertures 47 through all of the projecting side lugs are round, butthe side of each of the bolt-rods at their threaded end portions areflattened along their sides that lie adjacent to the sides of thecylinder. This flattened portion extends far enough from the ends of thebolt-rods to permit flat faced lugs 47A, which form a part of theprojecting lugs 46A at the rear end of the cylinder and also form a partof and project from the side of the rear end of the cylinder, to bearagainst the Hattened sides of the bolt-rods and thus prevent thebolt-rods from turning in their apertures 47 of their supporting lugs.The nuts 5lA are eah provided with a projecting key portion 5l, whichextends cross its squared up end. Ihese key portions 51B are adapted totit into head, and they lock dentally unscrewing from the ends of thebolt-rods when the bolt-rods are tightly bolted in their operativepositions.

these parts to effect yielding side rod bolts, as

larger -diameter than those through which the bolt-rods extend toreceive and form housings for coiled expansive springs 50, which aremounted on the ends of the bolts, preferably adjacentto the heads 51 ofthe bolts, and consequently are compressed between the heads of the boltrods and the wall 49A at the bottom of the apertures 49 that surroundthe bolt-rod receiving apertures 47. The nuts 51A are screwed onto thebolts and against the lugs of the rear cylinder head to exertsuliicientiresilient expansive compressive pressure on the cylinderheads and cap against the ends of the cylinder to hold these parts inoperative alinement. The cylinder heads 25 and 26, with their internalcooperating parts, and the cylinder rings 129 and 43 are fit-ted in suchrelative relation to each other and to the shoulders between the counterbores 23 and 24 and the cylinderbore that these cylinder rings 29 and 43are held tightly against these shoulders by the resilient clampingtension of the springs on the bolts 48.

have found in practice that the tension best adapted to the operative,stationary and slipping condition of the ratchet ring should esufficient to exert a pulling pressure on the rear cylinder head againstthe ratchet ring and of the ratchet ring against the rear cylinder ringsuch as would require the use by an operator of a wrench of about a footin length applied to the drill-bit to turn the chuck and hammer pistonand the rifle bar against the teeth of the ratchet ring in order tocause the ratchet ring to rotatively slip in its seat.

The rear cylinder head isI provided with an axial recess bore 52thatextends into its hub portion a short distance, and in it a ratchet ring53 is rotatably mounted. This ratchet ring is, however, enough thickerthan the depth of the recess 52 to project a trifle ping or yieldingpressure by the resiliently will be readily understood.

An axial aperture 63 is formed entirely through the rifle bar and anaxial aperture 67 is also formed through the hammer piston. Theseapertures (33 and 67 large enough to receive tube 68, which extends thefront cylinder head 26. The cylinder is provided with a valve chest 69,which preferably is position'edrcentrally on top of and lengthwise of itand -an air inlet valve 84 is arranged to control the admission of airto the valve chest.

In case the drill bit sticks in a seam in the rock vduring the operationof the machine,

its seat in the recess of the rear cylinder -head and the rear cylinderring, due to the yielding connections provided by the present invention.

While I have illustrated and described the preferred construction andarrangement of -my improved rock drilling engine, I do not wish to belimited to the construction and arrangement shown, as many changes mightbe made therein without departing from the spirit of my invention.

`Having described my invention, what I claim as new and desire to secureby Letters Patent is:

1. In a rock drilling engine, the combi? nation of a cylinder providedwith a front and a rear cylinder head, a drill bit driving hammer pistonreciprocally mounted in said cylinder, a. drill bit holding chuck saidfront cylinder head', rings in the opposite end port-ions of saidcylinder arranged to define the reciprocal movement of said hammerpiston, lugs on the opposite side portion of said cylinder and itsheads, said lugs being provided with bolt-rod receiving apertures,bolt-rods extending through the apertures of said lugs and provided withheads at one of their ends positioned adjacent to thefront side of thelugs of said front cylinder head, said bolts being arranged to extendloosely through said lugs from the front end ot the drilling engine andto lie alongside of said cylinder, nuts threaded to the ends of saidbolt rods, eX- pansive springs mounted on said bolt rods between thehead portions of said bolt rods and the front side of the lugs ot saidfront cylinder head, said nuts being adapted 1to clamp said cylinderheads and said cylinder bet-weon said springs and the heads of saidbolts, a flattened portion on the sides of said bolt rods adjacent tosaid cylinder, and a lug on each side of said cylinder arranged toproject against the flattened portion of said bolt rods and adaptd toprevent said bolt-rods from turning.

Q. In a roel; drilling engine, the combination of the cylinder' providedwith cylinder rings and with heads fitting opposite ends, one ot whichis provided with a cap which forms an extension thereof, the side boltrods provided with springs and with nuls on their ends, said side rodsbeing con` nected to said heads and arranged to clamp theln to saidcylinder with an adjustable resiliently yielding {.irossure, and ahousing on onc of said heads for said springs.

3. lu a roch drilling engine, thecol'nbination of a cylinder providedwith cylinder headsy al its opposite ends, one ot' which is providedwith an extending cap portion that forms a part thcrcot, ings on theopposite cylinder head and on the cap portion ot said other "r'liudcrhead, provided with bolt receiving apertures, bolts provided with headportions extending through the lugs of one head and through the lugs ofsaid cylinder into and through the lugs of the cap portion of theopposite cylinder head, expansive springs on said bolts at their headportions, which are adapted to be housed in sockets formed in said cap,and to abut against the bottoms of the sockets and the heads of thebolts, and nuts threaded to the opposite ends of said bolt rods andadapted to be screwedagainst the adjacent cylinder head and to compresssaid springs to draw 'on said bolts to clamp said cylinder heads to saidcylinder with an adjustable resilient yielding pressure, lugs projectingfrom the opposite sides of said cylinder and a flattened portion on saidbolt-rods arranged to' engage said lugs and prevent said rods fromturning, a keyway slot extending across the rear .face of the lugsf saidrear head in diametrical alinement with the bolt apertures through saidlugs and a projecting lug shaped key portion formed on each nut of saidside rods arranged to seat itself into the keyway recess of said lugs.

4. In a rock drilling engine, the combination of the cylinder and thecylinder heads, one of which is provided with a cap portion, aperturedlug portions on the oppo site side portions of said cylinder andcylinder head and saidv cap, bolt rods extending through said aperturedlugs each of which is provided with a head, threaded end portions andnuts on the opposite end portions of said bolt rods, expansive springs on said rods between said heads and said cap arranged to exert aresilient yielding pressure on said cylinder and it-s heads, housings being formed in said cap to receive said springs, and means includingrings in the opposite ends of said cylinder' for receiving the clampingthrust of said cylinder heads v againstsaid cylinder.

5. In a rock drilling engine, thc-combination of the cylinder providedwith a piston bore and With a counterbore, provided with a shoulderbetween said cylinder-s pist-on bore and said counterbore, and thecylinder head projecting into said counterlmrc, a ring seated in theshouldered counterlmre of said cylinder between said rear cylinder headand said shoulder, a circumferential groove in the peripheral surface ofsaid cylinder ring, and a packing in said groove adapted and arranged toprevent the leaking of compressed air from said cylinders bore past saidcylinder ring aud said rear cylinder head to the atmosphere.

(3. In a compressed air or other actuating fluid operated rock drillingengine, the com4 bination ot' the supporting shell provided withguideways and a depending huh pow tion, a cylinder provided .vithcylinder' heads litting loosely into the Opposite end portions of saidcylinder, and bolt rods extending along the opposite sides of saidcylinder and vits cylinder heads provided with springs and with nutsthreaded to said rods arranged and adapted to clampingly bolt saidcylinder and its cylinder heads and said drill bit operating mechanismin operative relation together by a resiliently yielding clampingpressure that wlll under normal Ioperation resist rotative strains andthat will prevent the breakage of said drill bit operatng mechanismunder abnormal operative strains by slipping rotatively. x

In testimony whereof I affix my signature in presence of two witnesses.

JOHN GERGE LEYNER. Witnesses:

G. SARGENT ELLIOTT,

ROBERT J. WALTMAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner o1 Patents,

Washington, D. C.

